Hi Guix, Ludo,

Here's a new 'wireservice-package' macro that factors the packages that
used to inherit for a base package with '#f fields. The main change is
that native-inputs are no longer common, I toyed with a more complicated
macro that would allow extending them but in the end I think the simpler
the better!

WDYT?

Thanks for the suggestion! I need to learn me some more macro magic,
it's fun :-).

Pierre